WO2019137909A1 - Lampe à del et procédé de commande de lampe à del - Google Patents

Lampe à del et procédé de commande de lampe à del Download PDF

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Publication number
WO2019137909A1
WO2019137909A1 PCT/EP2019/050332 EP2019050332W WO2019137909A1 WO 2019137909 A1 WO2019137909 A1 WO 2019137909A1 EP 2019050332 W EP2019050332 W EP 2019050332W WO 2019137909 A1 WO2019137909 A1 WO 2019137909A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
group
groups
central
cavity
Prior art date
Application number
PCT/EP2019/050332
Other languages
English (en)
Inventor
Hexi QIN
Jiang Zhang
Original Assignee
Signify Holding B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Signify Holding B.V. filed Critical Signify Holding B.V.
Publication of WO2019137909A1 publication Critical patent/WO2019137909A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
    • F21Y2105/16—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array square or rectangular, e.g. for light panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F21Y2105/14—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array
    • F21Y2105/18—Planar light sources comprising a two-dimensional array of point-like light-generating elements characterised by the overall shape of the two-dimensional array annular; polygonal other than square or rectangular, e.g. for spotlights or for generating an axially symmetrical light beam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • This invention relates to LED lamps and in particular for providing a light output with a controllable beam width and/or direction.
  • LED lighting is becoming increasing common in nearly all lighting applications. It offers low power consumption combined with the ability to create dynamic intensity and color lighting effects.
  • One function which is also desired in some lighting applications is control of the beam angle of an illumination beam, and/or control of a beam output direction.
  • One known way to implement an adjustable beam angle for an LED lamp is to use a telescopic tube. When the tube is retracted, a large beam angle is achieved, and when the tube is extended, a smaller beam angle is achieved.
  • US9470406 discloses light sources with arrangements of multiple LEDs (or other light-emitting devices) disposed at or near the focus of a reflecting optic having multiple segments facilitate varying the angular distribution of the light beam (e.g., the beam divergence) via the drive currents supplied to the LEDs.
  • a LED lamp comprising: a LED array comprising a central LED group wherein the group has a first optical axis, and at least one peripheral arrangement of LED groups around the central group of LEDs;
  • a LED driver which is adapted to drive independently at least the central LED group and the peripheral arrangement of LED groups thereby to implement beam angle control, wherein the LED driver is adapted to drive the central group of LEDs for generating a narrow beam and to drive at least the peripheral arrangement of LED groups for generating a wide beam.
  • This LED lamp makes use of an array of LEDs at different positions under a collimator lens. By selecting which LED group or LED groups to illuminate, the beam angle may be controlled. In particular, the lamp can switch between a narrow beam and a wide beam output with no moving parts. Note that the terms “narrow beam” and “wide beam” are simply used as relative terms, i.e. there is one drive configuration which generates a wider beam than the other. By way of example only, a narrow beam for example has a beam angle (the full cone angle) of less than 20 degrees whereas a wide beam for example has a beam angle (the full cone angle) of more than 20 degrees.
  • the peripheral arrangement of LED groups and the central LED group generate an output beam with different beam angles, and one may be selected, or the other, or a combination.
  • the beam angle is selectable independently of output color. In other words, the same color output may be generated but with different beam angles.
  • the LED array may be formed of LEDs all of the same color, but it is equally possible for the LED array to include LEDs of different color.
  • each LED group may itself comprise an array of different color LEDs.
  • the driving is simplified, in that there is a reduced number of channels.
  • optical axis of a group of LEDs is meant a general illumination direction, for example a direction about which the light distribution has the greatest rotational symmetry, when all LEDs of the group are illuminated. It is for example a normal direction to the light emitting surface of the individual LEDs within the group and extending from a center of area of the group of LEDs.
  • the peripheral groups of LEDs surround the central group, thus forming a closed shape i.e. an annulus around the central group.
  • the LED groups in the peripheral arrangement for example lie on a circular path, but they may for example form a square (if there are four LED groups in the peripheral group) or any other polygonal shape.
  • the LED driver is adapted to drive independently the central LED group, a first sub-group of the peripheral arrangement of LED groups for creating a first elongate beam shape and a second sub-group of the peripheral arrangement of LED groups for creating an elongate beam shape in an orthogonal direction to the first elongate beam shape.
  • the collimator lens may comprise:
  • a solid body having a first cavity extending into the solid body from a first outer surface, with the LED array provided in the vicinity of the first outer surface at an opening of the first cavity and an end of the first cavity defining a collimating lens surface;
  • This is a low cost and compact collimator design. Light rays emitted near to the normal are refracted by a lens surface, and light rays with a larger angle to the normal are reflected from the side wall.
  • the side wall may provide reflection by total internal reflection.
  • the first cavity is for example circular in cross section perpendicular to the first optical axis. This enables a rotationally symmetric design.
  • the first cavity may be aligned along the first optical axis and is a cylinder or a conical frustum with a slant angle of less than 10 degrees.
  • the angle of the conical frustum is for example simply sufficient to function as a draft angle for injection molding purposes.
  • the opening of the first cavity (which is coplanar with the first outer surface) is for example circular with a radius R and the peripheral arrangement of LED groups is arranged around the optical axis with a radius not less than 0.5R.
  • the LEDs in the peripheral arrangement have a significant displacement from the optical axis so that they create a differently directed output beam.
  • the light exit surface may comprise a diffusive surface.
  • This diffusive surface may be provided over the outermost part of the light exit surface, and also over any recess provided in that surface (discussed below).
  • the diffusive surface may be formed as a microlens surface or other kinds of surface texture.
  • the solid body may have a second cavity extending into the solid body from the light exit surface. The use of this cavity reduces light loss through the solid body as well as reducing weight of the optical component.
  • the second cavity is preferably also aligned along the first optical axis and is a cylinder or a conical frustum with a slant angle of less than 10 degrees.
  • the angle of the conical frustum is again for example simply sufficient to function as a draft angle for injection molding purposes.
  • the second cavity for example has a larger maximum radius than the maximum radius of the first cavity. Thus, it provides a significant reduction in weight.
  • the peripheral arrangement of LED groups for example comprises four groups of LEDs at 90-degree angular separation.
  • each LED group to direct a beam generally in one of four orthogonal directions (i.e. up, down, left, right) and by selecting a suitable combination, beam steering is possible.
  • the LED groups may be selected in opposing pairs to general an elongate e.g. elliptical beam shape.
  • the LED driver may instead be adapted to drive independently the central LED group and each LED group of the peripheral arrangement of LED groups thereby to implement beam angle control and beam steering. This requires more channels (one for each LED group) but gives additional control options.
  • the collimator lens for example comprises a body of glass or a polymer selected from poly (methyl methacrylate) (PMMA), polycarbonate and polyethylene terephthalate or a blend of one of more of these polymers.
  • PMMA poly (methyl methacrylate)
  • PMMA poly (methyl methacrylate)
  • polycarbonate polycarbonate
  • polyethylene terephthalate polyethylene terephthalate
  • One option is a lens body of poly (methyl methacrylate.
  • the invention also provides a method of controlling a LED lamp which comprises a LED array comprising a central LED group wherein the group has a first optical axis and at least one peripheral arrangement of LED groups around the central LED group; and a collimator lens provided over the LED array, wherein the method comprises:
  • the method may comprise driving the central LED group for generating a narrow beam; and driving at least the peripheral arrangement of LED groups for a generating a wide beam, thereby to implement beam angle control.
  • the method may comprise driving independently all of the LED groups thereby to implement beam angle and beam steering control.
  • Figure 1 shows a LED lamp
  • Figure 2 shows a multi-channel LED driver for driving the lamp
  • Figure 3 shows the light output paths from the central group of LEDs and separately the light output paths from one LED group from the peripheral arrangement
  • Figure 4 shows a table of possible drive levels to the three channels of the driver of Figure 2;
  • Figure 5 shows a method of controlling a LED lamp.
  • the invention provides a LED lamp, having a central LED group of LEDs and at least one peripheral, i.e. annular, surrounding arrangement of LED groups, with a collimator lens provided over the LED array.
  • the central LED group and the peripheral arrangement of LED groups can be driven independently to implement beam angle control and/or beam steering. This provides electronic control in way which does not impact on the optical efficacy of the lamp.
  • FIG 1 shows a LED lamp 10, comprising a LED array 12 on a substrate 13 such as a PCB and a collimator lens 14 provided over the LED array.
  • the lamp is shown in cross section in the top part and from beneath in the bottom part (to show the LED array design).
  • the collimator lens 14 comprises a solid body 16 having a first cavity 18 extending into the solid body from a first outer surface 20, in particular a base of the solid body, where "base” is used to mean the region where the LED array is located.
  • the LED array 12 is provided in the vicinity of the first outer surface 20 at an opening of the first cavity 18.
  • the first cavity is generally cylindrical, although it may have a draft angle to assist in injection molding of the solid body, for example from a plastics material such as PMMA. This draft angle is for example less than 10 degrees (on each side, i.e. opposing regions have an angle of less than 20 degrees to each other).
  • the solid body may be PMMA as mentioned above, but it may instead be a body of glass or a polymer selected from poly (methyl methacrylate), polycarbonate and polyethylene terephthalate or a blend of one of more of these polymers.
  • the body 16 has a light exit surface 24 opposite the first surface 20.
  • this light exit surface may be considered to be the top. This has a larger area than the first outer surface 20 of the solid body so that the body forms a tulip shape.
  • a side wall 26 extends between the first outer surface 20 of the solid body 16 (the base) and the light exit surface 24 (the top).
  • the solid body has an axis 28 of rotational symmetry and this functions as the general optical axis of the lamp, namely an axis about which the light output from the lamp has the greatest degree of rotational symmetry (when all LEDs are illuminated). This axis is normal (i.e. perpendicular) to a light exit surface of the LEDs of the LED array.
  • the cavity 18 has a central length axis aligned with the optical axis 28.
  • Light rays emitted near to this normal are refracted by the lens surface 22, and light rays with a larger angle to the normal are reflected from the side wall 26.
  • the side wall 26 provides reflection by total internal reflection.
  • the LED array 12 comprises a central LED group 120 of LEDs wherein the central group has a first optical axis corresponding to the axis 28, and at least one peripheral arrangement of LED groups 122, 124, 126, 128 around the central group 120 of LEDs.
  • central group 120 there is one central group 120 centered on the optical axis 28 and four LED groups around the outside, forming an annulus (i.e. any closed shape around the central group 120).
  • the LED groups of the peripheral arrangement are uniformly angularly spaced around the central group so that in the example shown they form a square.
  • the peripheral arrangement of LED groups 122, 124, 126, 128 is arranged around the optical axis with a radius not less than 0.5R. In this way, the LEDs in the peripheral arrangement have a significant displacement from the optical axis 28 so that they create a differently directed output beam primarily as a result of the different positioning with respect to the lens surface 22.
  • the solid body 16 also has a second cavity 30 extending into the solid body 16 from the light exit surface 24. This cavity is used to reduce light loss through the solid body as well as reducing weight of the optical component.
  • the second cavity 30 is also aligned along the optical axis 28 and is also a cylinder or a conical frustum with a slant angle of less than 10 degrees (on each side), again for injection molding purposes.
  • the second cavity is larger than the first cavity, namely with a larger maximum radius than the maximum radius of the first cavity 18.
  • Figure 2 shows that the LED lamp is driven by a LED driver 40, which is adapted to drive independently at least the central LED group and the peripheral arrangement of LED groups 122, 124, 126, 128 thereby to implement beam angle control.
  • the LED driver has three channels. Channel 1 is for the central LED group 120. Channel 2 is for the left and right LED groups 124, 128 and channel 3 is for the top and bottom LED groups 122, 126.
  • a narrow beam results in a normal direction (along the optical axis 28). If all LED groups are actuated, a wide beam results in a normal direction. The intensity of the central part of the beam can be controlled by using or not using the central group. If only the left and right LED groups are actuated (with or without the central group) a generally elliptical output beam shape is provided with a length axis in the left-right direction.
  • a generally elliptical output beam shape is provided with a length axis in the up-down direction.
  • the LED driver is able to drive the central group of LEDs for generating a narrow beam and to drive at least the peripheral arrangement of LED groups for a generating a wide beam.
  • first channel for a central LED group
  • second channel for driving LED groups to create an elongate beam shape in a first direction
  • third channel for driving LED groups to create an elongate beam shape with an orthogonal orientation
  • the central group may itself be formed as a ring of LEDs.
  • the LED lamp makes use of an array of LEDs at different positions under a the collimator lens. By selecting which LED group or LED groups to illuminate, the beam angle may be controlled.
  • the beam angle is selectable independently of output color.
  • the same color output may be generated but with different beam angles.
  • the LED array may be formed of LEDs all of the same color, but it is equally possible for the LED array to include LEDs of different color.
  • each LED group may itself comprise an array of different color LEDs.
  • color control may be achieved.
  • each channel shown in Figure 2 may be dividing into three sub-channels to enable beam angle/shape control as well as output color control.
  • Figure 3 shows in the top part the light output paths from the central group 120 of LEDs, to show a narrow beam directed in a normal direction.
  • Figure 3 shows in the bottom part the light output paths from one LED group 128 from the peripheral arrangement, to show a beam directed in an off-axis direction.
  • the light exit surface 24 may comprise a diffusive surface. This diffusive surface may be provided over the outermost part of the light exit surface shown as 24a in Figure 1 , and also over the base of the second cavity 30 shown as 24b in Figure 1.
  • the diffusive surface may be formed as a microlens surface or other kinds of surface texture.
  • Figure 4 shows a table of possible drive levels to the three channels (Chl, Ch2 and Ch3) for the example above. It shows various options which create the same overall light output flux.
  • the columns of the table show the drive levels as in terms of the flux level (in units of candela (cd)) to be output by the central FED group (C), the upward FED group (U), the downward FED group (D), the left FED group (F) and the right FED group (R).
  • the next column is the summation (SUM) of these flux levels.
  • the next column is the beam angle (BA) and the next is the optical efficiency (O.E.).
  • the beam angle is the full width at half maximum (FWHM) angle.
  • the final column shows a schematic representation of the light distribution.
  • the first row of data shows the central FED group as dominant, giving a narrow beam profile.
  • the intensity of the output from the central group is kept to a limit (185) and the other FED groups are used to contribute to the overall light output (385).
  • the central group can create sufficient light intensity alone, an even narrower beam may be obtained.
  • the second row of data shows equal driving of the five FED groups, thereby giving a larger beam angle.
  • the third row shows increased flux to the peripheral FED groups (and reduced flux to the central group to maintain the same overall flux) giving an even wider beam angle.
  • the fourth row shows yet further increased flux to the peripheral FED groups (and reduced flux to the central group to maintain the same overall flux) giving an even wider beam angle.
  • the fifth row shows yet further increased flux to the peripheral FED groups (and reduced flux to the central group to maintain the same overall flux) giving an even wider beam angle.
  • the last row shows an asymmetric beam shape by using only the up and down FED groups and the central group (to a small degree).
  • the beam angle is 53 degrees and 27 degrees in two orthogonal directions.
  • many other control settings are possible, and a five-channel system will enable beam steering as well as beam shaping.
  • Figure 5 shows a method of controlling a LED lamp which comprises a LED array comprising a central LED group wherein the group has a first optical axis and at least one peripheral arrangement of LED groups around the central LED group; and a collimator lens provided over the LED array, wherein the method comprises:
  • step 50 driving the central LED group for generating a narrow beam; and in step 52 driving at least the peripheral arrangement of LED groups for a generating a wide beam, thereby to implement beam angle control.
  • the method may comprise driving independently all of the LED groups thereby to implement beam angle and beam steering control.
  • the center LED group may comprise a single LED although it may also comprise an array of LEDs. Similarly, each LED group may comprise one or more individual LEDs.
  • the LED lamp of the invention is for example of interest for applications such as retail stores and museums, where changes in layout may take place regularly, and

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

La présente invention concerne une lampe à DEL comprenant un groupe de DEL central et au moins un agencement périphérique, c'est-à-dire annulaire, de groupes de DEL, une lentille de collimateur étant disposée sur la barrette de DEL. Le groupe de DEL central et l'agencement périphérique de groupes de DEL peuvent être entraînés indépendamment pour mettre en œuvre un réglage d'angle de faisceau et/ou une orientation de faisceau. Ceci permet une commande électronique d'une manière qui n'a pas d'impact sur l'efficacité optique de la lampe.
PCT/EP2019/050332 2018-01-10 2019-01-08 Lampe à del et procédé de commande de lampe à del WO2019137909A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CNPCT/CN2018/072093 2018-01-10
CN2018072093 2018-01-10
EP18155820 2018-02-08
EP18155820.6 2018-02-08

Publications (1)

Publication Number Publication Date
WO2019137909A1 true WO2019137909A1 (fr) 2019-07-18

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PCT/EP2019/050332 WO2019137909A1 (fr) 2018-01-10 2019-01-08 Lampe à del et procédé de commande de lampe à del

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020130685A1 (de) 2020-11-20 2022-05-25 Bartenbach Holding Gmbh Strahler sowie Leuchte mit einer Vielzahl solcher Strahler

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009063411A2 (fr) * 2007-11-16 2009-05-22 Koninklijke Philips Electronics N. V. Bloc d'éclairage orientable à ultrasons
WO2011144597A2 (fr) * 2010-05-21 2011-11-24 Oliver Shakespeare Dispositif d'éclairage
EP2578452A1 (fr) * 2011-10-06 2013-04-10 Koito Manufacturing Co., Ltd. Dispositif de commande d'une lampe de véhicule et système pour une lampe de véhicule
WO2013088299A1 (fr) * 2011-12-13 2013-06-20 Koninklijke Philips Electronics N.V. Collimateur optique pour lumières à diodes électroluminescentes
US20130208466A1 (en) * 2012-02-14 2013-08-15 Av Tech Corporation Illuminating Device with Adjustable Light Beams and Method for Assembling the Same
US20130214696A1 (en) * 2012-02-16 2013-08-22 Av Tech Corporation Light-Emitting Diode with Adjustable Light Beams and Method for Controlling the Same
US9470406B2 (en) 2012-09-24 2016-10-18 Terralux, Inc. Variable-beam light source and related methods
US20170268743A1 (en) * 2012-05-06 2017-09-21 Lighting Science Group Corporation Tunable lighting apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009063411A2 (fr) * 2007-11-16 2009-05-22 Koninklijke Philips Electronics N. V. Bloc d'éclairage orientable à ultrasons
WO2011144597A2 (fr) * 2010-05-21 2011-11-24 Oliver Shakespeare Dispositif d'éclairage
EP2578452A1 (fr) * 2011-10-06 2013-04-10 Koito Manufacturing Co., Ltd. Dispositif de commande d'une lampe de véhicule et système pour une lampe de véhicule
WO2013088299A1 (fr) * 2011-12-13 2013-06-20 Koninklijke Philips Electronics N.V. Collimateur optique pour lumières à diodes électroluminescentes
US20130208466A1 (en) * 2012-02-14 2013-08-15 Av Tech Corporation Illuminating Device with Adjustable Light Beams and Method for Assembling the Same
US20130214696A1 (en) * 2012-02-16 2013-08-22 Av Tech Corporation Light-Emitting Diode with Adjustable Light Beams and Method for Controlling the Same
US20170268743A1 (en) * 2012-05-06 2017-09-21 Lighting Science Group Corporation Tunable lighting apparatus
US9470406B2 (en) 2012-09-24 2016-10-18 Terralux, Inc. Variable-beam light source and related methods

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020130685A1 (de) 2020-11-20 2022-05-25 Bartenbach Holding Gmbh Strahler sowie Leuchte mit einer Vielzahl solcher Strahler
EP4001748A1 (fr) * 2020-11-20 2022-05-25 Bartenbach Holding GmbH Émetteur, ainsi que luminaire doté d'une pluralité de tels émetteurs

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